Introduction
A dynamic IP address is an IP address that changes from time to time unlike a static IP address. Most home networks are likely to have a dynamic IP address and the reason for this is because it is cost effective for Internet Service Providers (ISP) to allocate dynamic IP addresses to their customers.
Instead of one IP address always being allocated to your home network (Static IP), your IP address is pulled from a pool of addresses and then assigned to your home network by your ISP. After a few days, weeks or sometimes months that IP address is put back into the pool and you are assigned a new IP address.
General information about Internet Protocol (IP) addresses
What is an Internet Protocol (IP) address?
An IP address is a number which computers use to identify a location on the network, whether the public Internet or a private network. The number is in the format #.#.#.# where the # may be any number from 0 to 255. For example, 123.12.1.0. Learn more technical details.
Do I have an IP address?
Yes, everyone on the Internet has an IP address, whether you know it or not!
How does OpenDNS use IP addresses?
OpenDNS uses IP addresses to know that a DNS request is coming from you. With a free OpenDNS account, you are only able to register one single IP (network) address under your account. OpenDNS delivers custom DNS preferences and statistics based on the network association, which you establish and verify with a free OpenDNS account in the Dashboard.
Note:
OpenDNS does not provide IP addresses. Those come from your Internet provider.
How do I know my IP address?
On the OpenDNS Dashboard, your current IP address is displayed at the top right of the page. 
You may also confirm at https://myip.dnsomatic.com — you're shown your public IP address, nothing more.
How do I know if my IP address is dynamic?
If you don't know, then your IP is probably dynamic. However, you can contact your ISP and find out!
Public versus private IP address
OpenDNS, like all public Internet services, only sees your "public" IP address when you make a DNS request. At a public wifi sport or behind a router at home, your individual computer may have a different, private IP address, visible only to those inside your network. If an IP address starts with 192.168 or 10.10, for example, that is a private network IP address, not available to the public Internet.